GROWTH, STRUCTURE, DIELECTRIC BEHAVIOR AND AC-CONDUCTIVITY OF PYROCHLORE LEAD-SCANDIUM TANTALATE SINGLE-CRYSTALS

Authors
PETROVA D DOBREVA S VELEVA M MACICEK J GOSPODINOV M
Citation
D. Petrova et al., GROWTH, STRUCTURE, DIELECTRIC BEHAVIOR AND AC-CONDUCTIVITY OF PYROCHLORE LEAD-SCANDIUM TANTALATE SINGLE-CRYSTALS, Materials research bulletin, 32(11), 1997, pp. 1543-1549
Citations number
13
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
32
Issue
11
Year of publication
1997
Pages
1543 - 1549
Database
ISI
SICI code
0025-5408(1997)32:11<1543:GSDBAA>2.0.ZU;2-X
Abstract
The conditions for growing monocrystals of the Pb-Sc-Ta-O system by th e high-temperature solution growth method were optimized. The elementa l analysis revealed their composition is Pb-1.944(Sc0.506Ta1.494)O-6.4 38 X-ray diffraction analysis showed a cubic pyrochlore-type structure (space group Fd3m) with lattice parameter n = 10.6311(3) Angstrom. Th e dielectric constant and the dielectric losses are measured in the te mperature range 100-600 K and frequency range 10(2)-10(7) Hz. From the real and imaginary part of the AC conductivity, it is concluded that the charge transfer is accomplished through hoppings between localized states. (C) 1997 Elsevier Science Ltd.